ISO/WD 24104

A working group has prepared a draft.

Abstract

This proposal specifies a method for determining sulfite(sulphite) content in meat, fish and their products by acid-base titration. It is applicable to livestock meat, poultry meat, fish and other meat products. In our standard, the sample is treated by nitrogen-filled distillation method. After acidification, sulfite and other substances release sulfur dioxide under heating conditions. Hydrogen peroxide solution is used to absorb the distillate. The sulfur dioxide is dissolved in the absorption solution and oxidized to produce sulfuric acid. Titrate with sodium hydroxide standard solution. The content of sulfur dioxide in the sample was calculated according to the consumption of sodium hydroxide standard solution.